Add more performance tags.

pkg/analysis_server/lib/src/channel/channel.dart

Index: pkg/analysis_server/lib/src/channel/channel.dart
diff --git a/pkg/analysis_server/lib/src/channel/channel.dart b/pkg/analysis_server/lib/src/channel/channel.dart
index 71ee75e8409e9cec56192379a5d1b680031931fb..b90b282629b949f686e08618d04deb7607a9ca56 100644
--- a/pkg/analysis_server/lib/src/channel/channel.dart
+++ b/pkg/analysis_server/lib/src/channel/channel.dart
@@ -8,7 +8,6 @@ import 'dart:async';
 import 'dart:convert';
 
 import 'package:analysis_server/src/protocol.dart';
-import 'package:analyzer/src/util/utilities_timing.dart';
 
 /**
  * Instances of the class [ChannelChunkSink] uses a [Converter] to translate
@@ -127,18 +126,6 @@ class ResponseConverter extends Converter<Map, Response> {
  */
 abstract class ServerCommunicationChannel {
   /**
-   * A stopwatch used to accumulate the amount of time spent converting
-   * incomming requests from Json to objects.
-   */
-  static final CountedStopwatch FromJson = new CountedStopwatch();
-
-  /**
-   * A stopwatch used to accumulate the amount of time spent converting outgoing
-   * responses and notifications from objects to Json.
-   */
-  static final CountedStopwatch ToJson = new CountedStopwatch();
-
-  /**
    * Close the communication channel.
    */
   void close();